Field performance of RAS test sections and laboratory investigation of impact of rejuvenators on engineering properties of RAP/RAS mixes.

Details

• Creators:
  Im, Soohyok ; Zhou, Fujie
• Corporate Creators:
  Texas A&M Transportation Institute
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  Asphalt Pavements Benefit Cost Analysis Cracking Field Tests Laboratory Tests Mix Design Pavement Design Pavement Performance Reclaimed Asphalt Pavements Recycled Materials
• Publication/ Report Number:
  FHWA/TX-14/0-6614-3
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Corporate Publisher:
  Texas Department of Transportation. Research and Technology Implementation Office
• Abstract:
  In the last several years, recycled asphalt shingles (RAS), in addition to reclaimed asphalt pavement (RAP),
  
  have been widely used in Texas. The use of RAS can significantly reduce the cost of asphalt mixtures, conserve
  
  energy, and protect the environment. However, one of the major concerns is poor cracking resistance of RAS mixes
  
  due to super stiff asphalt binder in the RAS. This research focused on field performance of RAS test sections and
  
  the benefit of using rejuvenators in improving cracking resistance of RAS(/RAP) mixes. In addition, a simple cost
  
  analysis was performed to investigate the cost-benefits of using rejuvenators. It was found that both increasing
  
  design density (leading to higher virgin binder content) and using soft virgin binders (e.g. PGXX-28) can improve
  
  cracking resistance. With respect to improving cracking resistance of RAS mixes, the three rejuvenators evaluated
  
  in this research are all effective. Furthermore, the incorporation of rejuvenators also improved the moisture
  
  susceptibility and rutting resistance of the mixtures containing recycled materials. Apparently, additional tests and
  
  analyses are necessary. Specifically, field test sections with different types of rejuvenators should be constructed
  
  for further evaluation.
  
  Additionally, the observed field performance indicated that cracking performance is influenced by many
  
  factors, such as traffic, climate, existing pavement conditions for asphalt overlays, and pavement structure and layer
  
  thickness. It is extremely difficult to propose a single cracking requirement for all applications. There is a need to
  
  develop a RAP/RAS mix design and performance evaluation system for project-specific service conditions,
  
  including traffic, climate, existing pavement conditions, etc.
  
  
• Format:
  PDF
• Funding:
  Project 0-6614
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:0feb7fc280e4984a4b29eb8b19a25e7286dc076eafe0d62d712b320a86b97bf1084539ac65d10cab3f0b38734571bcdda0a77b10808e91407a9ed0cc3a466aa7
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27281/dot_27281_DS1.pdf
• File Type:
  [PDF - 2.28 MB ]